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Showing below up to 50 results in range #21 to #70.
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- Kewanee Group (103 members)
- Pope Megagroup (96 members)
- Carbondale Formation (95 members)
- Devonian System (84 members)
- Chesterian Series (80 members)
- Sandstone (77 members)
- Producing Zones and Informal Names (76 members)
- Sauk Sequence (76 members)
- Missourian Series (74 members)
- Valmeyeran Series (70 members)
- Mammoth Cave Limestone Megagroup (68 members)
- Cambrian System (66 members)
- Silurian System (62 members)
- Platteville Group (62 members)
- Trentonian Stage (60 members)
- Croixan Series (60 members)
- Knox Dolomite Megagroup (58 members)
- Bulletin 94 (57 members)
- Galena Group (56 members)
- Spoon Formation (51 members)
- Middle Devonian Series (50 members)
- Shale (49 members)
- Modesto Formation (46 members)
- Plattin Subgroup (46 members)
- Ancell Group (42 members)
- Elviran Stage (38 members)
- Mattoon Formation (38 members)
- Kimmswick Subgroup (36 members)
- Alexandrian Series (34 members)
- McCormick Group (32 members)
- Embayment Megagroup (32 members)
- Dresbachian Stage (32 members)
- Bond Formation (30 members)
- Cincinnatian Series (30 members)
- Glasford Formation (28 members)
- Wedron Group (28 members)
- Gasperian Stage (28 members)
- Abandoned Names (27 members)
- Atokan Series (26 members)
- Dunleith Formation (26 members)
- Mesozoic Erathem (24 members)
- Bulletin 104 (24 members)
- Abbott Formation (24 members)
- Knobs Megagroup (24 members)
- Trempealeauan Stage (24 members)
- Tertiary System (22 members)
- Banner Formation (22 members)
- Mason Group (22 members)
- Holocene Series (20 members)
- Maquoketa Shale Group (20 members)